To learn times tables from 11 to 20 easily, first you have to have to remember the product of any singe digit number by another single digit number.
Examples :
5 x 4 = 20
7 x 8 = 56
6 x 9 = 54
And it is difficult for us to remember answer for
two digit number x single digit number
and
two digit number x two digit number
Here, we have given shortcuts to find answer for the above multiplications which come in times table.
This method is explained for 1 at the ten's place of two digit number (Times Table).
Steps to be followed to understand the above shortcut :
Step 1 :
First take the single digit number and multiply it by 10.
(7 x 10 = 70 in the above example)
Step 2 :
Multiply the single digit and unit digit of the two digit number.
(7 x 2 = 14 in the above example)
Step 3 :
Add step 1 value and step 2 value.
(70 + 14 = 84 in the above example)
Try yourself :
12 x 5 = ?
16 x 7 = ?
19 x 4 = ?
In this way you can try a lot.
This method is explained for 1 at the ten's place of both the two digit numbers (Times Table).
Method 1 :
Method 2 :
Steps to be followed to understand both the methods :
Step 1 :
Add one of the two digit number and the digit in one's place in the other number. Multiply the result by 10.
(17 + 2 = 19 ----> 19 x 10 = 190)
or
(12 + 7 = 19 ----> 19 x 10 = 190)
Step 2 :
Multiply the digits in one's place of both the numbers.
Step 3 :
Add the results of step 1 and 2, you will get answer.
Try yourself :
12 x 15 = ?
14 x 16 = ?
18 x 19 = ?
In this way, you can try a lot.
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